#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2023, OpenNebula Project, OpenNebula Systems                #
#                                                                            #
# Licensed under the Apache License, Version 2.0 (the "License"); you may    #
# not use this file except in compliance with the License. You may obtain    #
# a copy of the License at                                                   #
#                                                                            #
# http://www.apache.org/licenses/LICENSE-2.0                                 #
#                                                                            #
# Unless required by applicable law or agreed to in writing, software        #
# distributed under the License is distributed on an "AS IS" BASIS,          #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
# See the License for the specific language governing permissions and        #
# limitations under the License.                                             #
#--------------------------------------------------------------------------- #

###############################################################################
# This script is used to flatten a snapshot of a persistent image
###############################################################################

# -------- Set up the environment to source common tools & conf ------------

if [ -z "${ONE_LOCATION}" ]; then
    LIB_LOCATION=/usr/lib/one
else
    LIB_LOCATION=$ONE_LOCATION/lib
fi

. $LIB_LOCATION/sh/scripts_common.sh

DRIVER_PATH=$(dirname $0)
CEPH_UTILS=${DRIVER_PATH}/ceph_utils.sh

source ${DRIVER_PATH}/../libfs.sh
source ${DRIVER_PATH}/../../etc/datastore/ceph/ceph.conf

# -------- Get image and datastore arguments from OpenNebula core ------------

DRV_ACTION=`cat -`
ID=$1

XPATH="${DRIVER_PATH}/../xpath.rb -b $DRV_ACTION"

unset i XPATH_ELEMENTS

while IFS= read -r -d '' element; do
    XPATH_ELEMENTS[i++]="$element"
done < <($XPATH     /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/BRIDGE_LIST \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/POOL_NAME \
                    /DS_DRIVER_ACTION_DATA/IMAGE/SOURCE \
                    /DS_DRIVER_ACTION_DATA/IMAGE/TARGET_SNAPSHOT \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/CEPH_USER \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/CEPH_KEY \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/CEPH_CONF)

unset i

BRIDGE_LIST="${XPATH_ELEMENTS[i++]}"
POOL_NAME="${XPATH_ELEMENTS[i++]:-$POOL_NAME}"
RBD_SRC="${XPATH_ELEMENTS[i++]}"
SNAP_ID="${XPATH_ELEMENTS[i++]}"
CEPH_USER="${XPATH_ELEMENTS[i++]}"
CEPH_KEY="${XPATH_ELEMENTS[i++]}"
CEPH_CONF="${XPATH_ELEMENTS[i++]}"

DST_HOST=`get_destination_host $ID`

if [ -z "$DST_HOST" ]; then
    error_message "Datastore template missing 'BRIDGE_LIST' attribute."
    exit -1
fi

if [ -n "$CEPH_USER" ]; then
    RBD="$RBD --id ${CEPH_USER}"
fi

if [ -n "$CEPH_KEY" ]; then
    RBD="$RBD --keyfile ${CEPH_KEY}"
fi

if [ -n "$CEPH_CONF" ]; then
    RBD="$RBD --conf ${CEPH_CONF}"
fi

SNAP_FLATTEN_CMD=$(cat <<EOF
    RBD="${RBD}"

    rbd_check_2 $RBD_SRC

    RBD_TGT=\$(rbd_find_snap $RBD_SRC $SNAP_ID)

    if [ -z "\$RBD_TGT" ]; then
        echo "Target RBD not found." >&2
        exit 1
    fi

    $RBD clone \${RBD_TGT}@$SNAP_ID $RBD_SRC.flatten

    $RBD flatten $RBD_SRC.flatten

    rbd_rm_r \$(rbd_top_parent $RBD_SRC)

    $RBD rename $RBD_SRC.flatten $RBD_SRC
EOF
)

ssh_exec_and_log_stdin "$DST_HOST" "$SNAP_FLATTEN_CMD" "$CEPH_UTILS" \
              "Error flattening snapshot $SNAP_ID for $RBD_SRC"
